{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical", "Disease"], "input": "Clinical evaluation included the use of the Unified Parkinson ' s Disease Rating Scale ( UPDRS ) , Hoehn _ Yahr score and Schwab England activities of daily living ( ADL ) score in ' on ' - and ' off ' - drug conditions before surgery and 6 months after surgery ."}
{"Chemical": [], "Disease": ["Parkinson ' s Disease"]}